Supplemental 1 – Table 2a, 2b. Status of N, P and K nutrients on several islands in Indonesia.

The average N nutrient content identified across the provinces of Java, Sulawesi, East Nusa Tenggara, and West Nusa Tenggara was classified as low, while it was medium in Sumatra and high in Kalimantan. A similar minimum N content of 0.05% was observed across different locations starting with East and West Nusa Tenggara, followed by Sulawesi and Java. The nutrient status of P and K was generally classified as high to medium, where fields with low P levels were only 12% and low K was observed in 21%.